"What Windows users know" doesn't mean that it's a good thing. Windows users also know to run everything with administrative privileges. For sufficiently sophisticated build systems (read: OBS) you can automatically rebuild packages. The reason why packaging takes time is because there is a testing process (which can also be automated with things like OpenQA), but there's lots of other maintainence that goes on when curating packages. Believe it or not, but sometimes upstream is downright irresponsible when doing version bumps and it's the maintainer's job to deal with it. It's fairly thankless work, to be honest, because you're not working on the new hot stuff. Sure, "just download a binary" works until you have multiple components that depend on each other.
> 2. Shared libraries are only good for saving space (irrelevant on desktop) and for security. Different side by side versions of libs work poorly when you reach "system" level is my experience. Several libc versions etc is painful.
"Only good for [...] security" is enough reason for me. Tell me how Windows programs deal with updates to critical libraries that everyone uses separately. I'm guessing the answer is "not well at all". And if you're going though your package manager, then no package should require a specific version of libc (besides, this problem can be mitigated somewhat with symbol versioning). The gains far outweigh the perceived costs IMO.
> "What Windows users know" doesn't mean that it's a good thing.
I know (I also removed it). It's patently stupid. Let me rephrase it if you want one way of distributing apps that anyone can use, it's basically the only working way. Download a binary from the creators' site. Otherwise you end up with the utterly broken method of "check if it's in a tree in some package repo, if not, you can add more package sources to your repo, or if not, you check if you can find a downloadable package for it, if not, you build from source".
> Tell me how Windows programs deal with updates to critical libraries that everyone uses separately
They don't. It's both a bug and a feature. OS libraries are updated of course (by windows update) but I don't necessarily consider e.g. a C++ runtime to be an OS library, even if it's microsofts' own redist. I prefer my applications to ship their own copy of their c++ runtime and keep it local because it limits problems. Even at the cost of having an unpatched one somewhere.
> Windows users also know to run everything with administrative privileges.
Well, accidentally answering "yes" to the UAC prompt is about as likely as accidentally sudoing something imo.